This is a list basis work, reputation and clientele, not culture. TMT is a vast area, so in my opinion good to bear in mind the kind of TMT work you would like to do -
Media - Gowree Gokhale at NDA, Ranjana Adhikari at Indus, Ameet Naik at Naik & Naik, Chandrima at DSK Legal, Saikrishna Rajgopal
Telecom - Stephen Mathais at Kocchar; Nikhil Narendran at Trilegal, Abhishek Malhotra @ TMT Law
Data - Nehaa Chaudhari at Ikigai, Rahul Mathan at Trilegal, Mathew Chacko at SRL, Arun Prabhu at CAM
Fintech - Anu Tiwari at CAM, Aparajita Srivastava at Ikigai Law; Mathew Chacko at Spice Route, Nikhil Narendran
Gaming - Ranjana Adhikari at Indus, Gowree Gokhale at NDA
Satcom and Space - Abhishek Malhotra @ TMT Law, Anirudh Rastogi at Ikigai, Ashok GV at Factum Law
Policy - Rahul Mathan at Trilegal, Nehaa Chaudhari at Ikigai
New tech - Anirudh Rastogi at Ikigai Law, Huzefa Tavawala at NDA
Blockchain - Anirudh Rastogi at Ikigai Law, Jaideep Reddy at NDA
VC - Archana Rajaram at Rajaram Legal, Roma Priya at Burgeon, Srinivas Katta at Indus Law, Manvindar Singh at JSA